Abstract
Although soil fungi may represent an ecologically important cause of mortality of buried seeds, few studies have provided direct evidence of the pathogenicity of fungi colonizing seeds in natural habitats. In response, we conducted a series of experiments to investigate the impacts of soil fungi from a range of habitats on seeds of meadow plants. We compared the survival of seeds of four grasses in five habitats, and isolated fungi from these seeds. We then tested the pathogenicity of selected isolates against two standard sets of plant species: the original four grasses and a broad range of old field species. We found that the soil community contained a large variety of seed-colonizing fungi. Some, but not all, examples of these fungi caused seed mortality; others may be harmless commensals. Some of these isolates negatively affected a broad range of plant species, but others had a more restricted host range; as a result, pathogenicity varied depending upon the particular plant-fungus combination. Few between-habitat differences in seed survival were detected. Our results demonstrate that fungal seed pathogens are common, ubiquitous, and potentially lethal, but that their effects depend on the particular combination of fungus and plant species considered.
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References
Agrios G.N. 1997. Plant Pathology (fourth edition). Academic Press, London, UK.
Augspurger C.K. 1983. Seed dispersal of the tropical tree Platypo-dium elegans, and the escape of its seedlings from fungal patho-gens.Journal of Ecology 71: 759-771.
Augspurger C.K. and Kelly C.K. 1984. Pathogen mortality of tropical tree seedlings: experimental studies of the effects of dis-persal distance, seedling density, and light conditions. Oecologia 61: 211-217.
Baskin C.C. and Baskin J.M. 1998. Seeds: Ecology, Biogeography, and Evolution of Dormancy and Germination. Academic Press, San Diego, USA.
Bever J.D. 1994. Feedback between plants and their soil commu-nities in an old field community. Ecology 75: 1965-1977.
Blaney C.S. and Kotanen P.M. 2001. Effects of fungal pathogens on seeds of native and exotic plants: a test using congeneric pairs. Journal of Applied Ecology 38: 1104-1113.
Blaney C.S. and Kotanen P.M. 2002. Persistence in the seed bank: an experimental comparison of native and alien plants. Écoscience 9: 509-517.
Bruehl G.W. 1987. Soilborne Plant Pathogens. MacMillan Publish-ing Company, New York, USA.
Burdon J.J. 1987. Diseases and Plant Population Biology. Cambridge University Press, Cambridge, UK.
Burdon J.J and Leather S.R. 1990. Pests, Pathogens, and Plant Communities. Blackwell Scientific Publications, Oxford, UK.
Carlisle M.J. and Watkinson S.C 1994. The Fungi. Academic Press Harcourt Brace and Co., New York, USA.
Carroll G.C. and Wicklow D.T. 1992. The Fungal Community: Its Organization and Role in the Ecosystem (second edition). Mar-cel Dekker Inc., New York, USA.
Cavers P.B. 1983. Seed demography. Canadian Journal of Botany 61: 3578-3590.
Chambers J.C. and MacMahon J.A. 1994. A day in the life of a seed: movements and fates of seeds and their implications for natural and managed systems. Annual Review of Ecology and Systematics 25: 263-292.
Clay K. 1990. Fungal endophytes of grasses. Annual Review of Ecology and Systematics 21: 275-297.
Clay K. and Schardl C. 2002. Evolutionary origins and ecological consequences of endophyte symbioses with grasses. The Ameri-can Naturalist 160 (Supplement): S99-S127.
Cook R. 1980. The biology of seeds in soil.. In: Solbrig O.E. (ed.), Demography and Evolution in Plant Populations. University of California Press, Berkeley, USA, pp.107-129
Crist T.O. and Friese C.F. 1993. The impact of fungi on soil seeds: Implications for plants and granivores in a semiarid shrub-steppe. Ecology 74: 2231-2239.
Dalling J.W., Swaine M.D. and Garwood N.C. 1998. Dispersal patterns and seed bank dynamics of pioneer trees in moist tropi-cal forest. Ecology 79: 564-578.
Darbyshire S.J. and Cayouette J. 1989. The biology of Canadian weeds 92: (Danthonia spicata L.). Canadian Journal of Plant Science 69: 1217-1233.
Dix N.J. and Webster J. 1995. Fungal Ecology. Chapman and Hall, New York, USA.
Dobson A. and Crawley M. 1994. Pathogens and the structure of plant communities. Trends in Ecology and Evolution 9: 393-398.
Domsch K.H., Gams W. and Anderson T. 1993. Compendium of Soil Fungi (2vols.). Academic Press, London, UK.
Farr D.F., Bills G.P., Chamuris G.P. and Rossman A.Y. 1989. Fungi on Plants and Plant Products in the United States. APS Press, Saint Paul, Minnesota, USA.
Garrett S.D. 1956. Biology of Root-infecting Fungi. Cambridge University Press, London, UK.
Garrett S.D. 1963. Soil Fungi and Soil Fertility. The MacMillan Company, New York, USA.
Gilbert G.S. 2002. Evolutionary ecology of plant diseases in natu-ral ecosystems. Annual Review of Phytopathology 40: 13-43.
Grime J.P., Hodgson J.G. and Hunt R. 1988. Comparative Plant Ecology. Unwin Hyman, London, UK.
Harper J.L. 1977. Population Biology of Plants. Academic Press, London, UK.
Keever C. 1953. Present composition of some stands of the former oak-chestnut forest in the southern Blue Ridge Mountains. Ecol-ogy 34: 44-54.
Kirk R.E. 1982. Experimental Design: Procedures for the Behav-ioral Sciences (second edition). Brooks and Cole, Monterey, California, USA.
Kirkpatrick B.L. and Bazzaz F.A. 1979. Influence of certain fungi on seed germination and seedling survival of four colonizing an-nuals. Journal of Applied Ecology 16: 515-527.
Larkin R.P., English J.T. and Mihail J.D. 1995. Identification, dis-tribution and pathogenicity of Pythium spp. associated with al-falfa seedlings. Soil Biology and Biochemistry 27: 357-364.
Leck M.A., Parker V.T. and Simpson R.L. 1989. Ecology of Soil Seed Banks. Academic Press, San Diego, USA.
Leishman M.R., Masters G.J., Clarke I.P. and Brown V.K. 2000. Seed bank dynamics: the role of fungal pathogens and climate change. Functional Ecology 14: 293-299.
Lonsdale W.M. 1993. Losses from the seed bank of Mimosa pigra: Soil micro-organisms vs. temperature fluctuations. Journal of Applied Ecology 30: 654-660.
Malone J.P. and Muskett A.E. 1964. Seed-borne Fungi. The Inter-national Seed Testing Association, Wageningen, The Nether-lands.
Mills K.E. and Bever J.D. 1998. Maintenance of diversity within plant communities: soil pathogens as agents of negative feedback. Ecology79: 1595-1601.
Morton J.K. and Venn J.M. 1990. A Checklist of the Flora of On-tario: Vascular Plants. University of Waterloo Biology Series, Waterloo, Ontario, Canada.
Packer A. and Clay K. 2000. Soil pathogens and spatial patterns of seedling mortality in a temperate tree. Nature 404: 278-281.
Packer A. and Clay K. 2003. Soil pathogens and Prunus serotina seedling and sapling growth near conspecific trees. Ecology 84: 108-119.
Roberts E.H. 1981. Seed banks in soils. Advances in Applied Bi-ology 6: 1-55.
Scheffer R.P. 1997. The Nature of Disease in Plants. Cambridge University Press, Cambridge, UK.
Simpson G.M. 1990. Seed Dormancy in Grasses. Cambridge Uni-versity Press, Cambridge, UK.
Stephenson S.L. 1986. Changes in a former chestnut-dominated forest after a half century of succession. American Midland Naturalist 116: 173-179.
Thompson K. 1987. Seeds and seed banks. New Phytologist 106)Supplement): 23-34.
Thompson K. 2000. The Functional Ecology of Soil Seed Banks. In: Fenner M. (ed.), Seeds: The Ecology of Regeneration in Plant Communities (second edition). CAB International, Oxford, UK, pp. 215-235.
Thompson K., Bakker J.P. and Bekker R.M. 1997. Soil Seed Banks of North-West Europe: Methodology, Density and Longevity. Cambridge University Press, New York, USA.
Van der Putten W.H. and Peters B.A.M. 1997. How soil-borne pathogens may affect plant competition. Ecology 78: 1785-1795.
Walker J.C. 1969. Plant Pathology. McGraw-Hill, New York, USA.
Watkinson A.R. 1998. The role of the soil community in plant population dynamics. Trends in Ecology and Evolution 13: 171-172.
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Schafer, M., Kotanen, P.M. Impacts of naturally-occurring soil fungi on seeds of meadow plants. Plant Ecology 175, 19–35 (2004). https://doi.org/10.1023/B:VEGE.0000048096.00772.23
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DOI: https://doi.org/10.1023/B:VEGE.0000048096.00772.23